參數(shù)資料
型號: MC68HC11A8BVP2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Single-Chip Microcontroller
中文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP48
封裝: DIP-48
文件頁數(shù): 22/158頁
文件大?。?/td> 776K
代理商: MC68HC11A8BVP2
MOTOROLA
2-6
SIGNAL DESCRIPTIONS AND OPERATING MODES
MC68HC11A8
TECHNICAL DATA
2
2.1.11.5 Port E
Port E is used for general-purpose inputs and/or analog-to-digital (A/D) input chan-
nels. Reading port E during the sampling portion of an A/D conversion could cause
very small disturbances and affect the accuracy of that result. If very high accuracy is
required, avoid reading port E during conversions.
2.2 Operating Modes
There are four operating modes for the MC68HC11A8: single-chip operating mode,
expanded multiplexed operating mode, special bootstrap operating mode, and special
test operating mode.
Table 2-1
shows how the operating mode is selected. The following paragraphs de-
scribe these operating modes.
2.2.1 Single-Chip Operating Mode
In single-chip operating mode, the MC68HC11A8 functions as a monolithic microcon-
troller without external address or data buses. Port B, port C, strobe A, and strobe B
function as general purpose l/O and handshake signals. Refer to
4 PARALLEL I/O
for
additional information.
2.2.2 Expanded Multiplexed Operating Mode
In expanded multiplexed operating mode, the MC68HC11A8 has the capability of ac-
cessing a 64 Kbyte address space. This total address space includes the same on-
chip memory addresses used for single-chip operating mode plus external peripheral
and memory devices. The expansion bus is made up of port B and port C, and control
signals AS and R/W.
Figure 2-4
shows a recommended way of demultiplexing low or-
der addresses from data at port C. The address, R/W, and AS signals are active and
valid for all bus cycles including accesses to internal memory locations.
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